Red Dead Redemption has numerous challenges for players to proclaim their mastery over the Wild West. Every RDR1 challenge comes with ranks that players have to complete in sequence. Along the way, they unlock new abilities en route to 100% completion. Initially, there were only four challenges in RDR1. More challenges were added with the release of the Liars & Cheats DLC pack, including two that could be completed in both the main game and Red Dead Redemption: Undead Nightmare. All challenges are included in RDR's Nintendo Switch and PS4 ports.
Source:https://www.cbr.com/rdr-explosive-rifle-guide/